91_Physics ProblemsTechnical Physics

91_Physics ProblemsTechnical Physics - 92 *P4.22 Motion in...

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92 Motion in Two Dimensions *P4.22 When the bomb has fallen a vertical distance 2.15 km, it has traveled a horizontal distance x f given by x yx gx v f ff f ii i i i i =− = −= ∴− = + = ∴= ± F H I K 325 215 2437 2 2 150 2 437 98 2280 2 150 2 437 371 19 1 6 565 4 792 0 1 2 6 565 6 565 4 1 4 792 3 283 3 945 22 2 2 2 2 2 2 2 .. . tan cos tan . cos tan . tan tan . tan . tan . . . . . . km km km m m ±ms ±m ms m m 2 a f a f bg ej af a f a f θ θθ Select the negative solution, since i is below the horizontal. tan . i 0662, i ° 33 5 . P4.23 The horizontal kick gives zero vertical velocity to the rock. Then its time of flight follows from yy v t a t t t fiy i y =+ + + + = 1 2 40 0 0 0
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